Quake 4 is the fourth title in the series of Quake first-person shooter computer games. The game was developed by Raven Software and published by Activision. Raven Software collaborated with id Software, the creators and historical developers of preceding Quake games. In this case, id Software supervised the development of the game as well as providing the Doom 3 engine, now referred to as "id Tech 4" and released under the GNU General Public License on 22 November 2011, upon which it was built. Quake 4 went gold in early October 2005 and was released on 18 October 2005 for Microsoft Windows and later for Linux, Xbox 360 and Mac OS X. A special DVD Collectors Edition also exists, including promotional material and the game Quake II with its expansions, The Reckoning and Ground Zero. The Xbox 360 version of Quake 4 is based on the Special Collectors Edition, and therefore also includes Quake II. On 4 August 2011 the game was made available through Steam.
Plotwise, the game is a sequel to Quake II and takes place during the same war as Enemy Territory: Quake Wars. Quake II, Quake 4, or Enemy Territory: Quake Wars do not share story lines with Quake or Quake III Arena; their only relation is their names and logos. Compared to other titles in the Quake series, Quake 4 has an increased emphasis on the single-player portion of the game. A multiplayer mode is available, but it does not involve playable bots like Quake III Arena, without 3rd party modifications
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